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fs/nfsd/nfs3acl.c
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81f7e3824 Initial Release, ... |
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// SPDX-License-Identifier: GPL-2.0 /* * Process version 3 NFSACL requests. * * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de> */ #include "nfsd.h" /* FIXME: nfsacl.h is a broken header */ #include <linux/nfsacl.h> #include <linux/gfp.h> #include "cache.h" #include "xdr3.h" #include "vfs.h" #define RETURN_STATUS(st) { resp->status = (st); return (st); } /* * NULL call. */ static __be32 nfsd3_proc_null(struct svc_rqst *rqstp) { return nfs_ok; } /* * Get the Access and/or Default ACL of a file. */ static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp) { struct nfsd3_getaclargs *argp = rqstp->rq_argp; struct nfsd3_getaclres *resp = rqstp->rq_resp; struct posix_acl *acl; struct inode *inode; svc_fh *fh; __be32 nfserr = 0; fh = fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); if (nfserr) RETURN_STATUS(nfserr); inode = d_inode(fh->fh_dentry); if (argp->mask & ~NFS_ACL_MASK) RETURN_STATUS(nfserr_inval); resp->mask = argp->mask; if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { acl = get_acl(inode, ACL_TYPE_ACCESS); if (acl == NULL) { /* Solaris returns the inode's minimum ACL. */ acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); } if (IS_ERR(acl)) { nfserr = nfserrno(PTR_ERR(acl)); goto fail; } resp->acl_access = acl; } if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { /* Check how Solaris handles requests for the Default ACL of a non-directory! */ acl = get_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) { nfserr = nfserrno(PTR_ERR(acl)); goto fail; } resp->acl_default = acl; } /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */ RETURN_STATUS(0); fail: posix_acl_release(resp->acl_access); posix_acl_release(resp->acl_default); RETURN_STATUS(nfserr); } /* * Set the Access and/or Default ACL of a file. */ static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp) { struct nfsd3_setaclargs *argp = rqstp->rq_argp; struct nfsd3_attrstat *resp = rqstp->rq_resp; struct inode *inode; svc_fh *fh; __be32 nfserr = 0; int error; fh = fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); if (nfserr) goto out; inode = d_inode(fh->fh_dentry); error = fh_want_write(fh); if (error) goto out_errno; fh_lock(fh); error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); if (error) goto out_drop_lock; error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); out_drop_lock: fh_unlock(fh); fh_drop_write(fh); out_errno: nfserr = nfserrno(error); out: /* argp->acl_{access,default} may have been allocated in nfs3svc_decode_setaclargs. */ posix_acl_release(argp->acl_access); posix_acl_release(argp->acl_default); RETURN_STATUS(nfserr); } /* * XDR decode functions */ static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_getaclargs *args = rqstp->rq_argp; p = nfs3svc_decode_fh(p, &args->fh); if (!p) return 0; args->mask = ntohl(*p); p++; return xdr_argsize_check(rqstp, p); } static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_setaclargs *args = rqstp->rq_argp; struct kvec *head = rqstp->rq_arg.head; unsigned int base; int n; p = nfs3svc_decode_fh(p, &args->fh); if (!p) return 0; args->mask = ntohl(*p++); if (args->mask & ~NFS_ACL_MASK || !xdr_argsize_check(rqstp, p)) return 0; base = (char *)p - (char *)head->iov_base; n = nfsacl_decode(&rqstp->rq_arg, base, NULL, (args->mask & NFS_ACL) ? &args->acl_access : NULL); if (n > 0) n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, (args->mask & NFS_DFACL) ? &args->acl_default : NULL); return (n > 0); } /* * XDR encode functions */ /* GETACL */ static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_getaclres *resp = rqstp->rq_resp; struct dentry *dentry = resp->fh.fh_dentry; p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0 && dentry && d_really_is_positive(dentry)) { struct inode *inode = d_inode(dentry); struct kvec *head = rqstp->rq_res.head; unsigned int base; int n; int w; *p++ = htonl(resp->mask); if (!xdr_ressize_check(rqstp, p)) return 0; base = (char *)p - (char *)head->iov_base; rqstp->rq_res.page_len = w = nfsacl_size( (resp->mask & NFS_ACL) ? resp->acl_access : NULL, (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); while (w > 0) { if (!*(rqstp->rq_next_page++)) return 0; w -= PAGE_SIZE; } n = nfsacl_encode(&rqstp->rq_res, base, inode, resp->acl_access, resp->mask & NFS_ACL, 0); if (n > 0) n = nfsacl_encode(&rqstp->rq_res, base + n, inode, resp->acl_default, resp->mask & NFS_DFACL, NFS_ACL_DEFAULT); if (n <= 0) return 0; } else if (!xdr_ressize_check(rqstp, p)) return 0; return 1; } /* SETACL */ static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_attrstat *resp = rqstp->rq_resp; p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); return xdr_ressize_check(rqstp, p); } /* * XDR release functions */ static void nfs3svc_release_getacl(struct svc_rqst *rqstp) { struct nfsd3_getaclres *resp = rqstp->rq_resp; fh_put(&resp->fh); posix_acl_release(resp->acl_access); posix_acl_release(resp->acl_default); } #define nfs3svc_decode_voidargs NULL #define nfs3svc_release_void NULL #define nfsd3_setaclres nfsd3_attrstat #define nfsd3_voidres nfsd3_voidargs struct nfsd3_voidargs { int dummy; }; #define PROC(name, argt, rest, relt, cache, respsize) \ { \ .pc_func = nfsd3_proc_##name, \ .pc_decode = nfs3svc_decode_##argt##args, \ .pc_encode = nfs3svc_encode_##rest##res, \ .pc_release = nfs3svc_release_##relt, \ .pc_argsize = sizeof(struct nfsd3_##argt##args), \ .pc_ressize = sizeof(struct nfsd3_##rest##res), \ .pc_cachetype = cache, \ .pc_xdrressize = respsize, \ } #define ST 1 /* status*/ #define AT 21 /* attributes */ #define pAT (1+AT) /* post attributes - conditional */ #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ static const struct svc_procedure nfsd_acl_procedures3[] = { PROC(null, void, void, void, RC_NOCACHE, ST), PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT), }; static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]; const struct svc_version nfsd_acl_version3 = { .vs_vers = 3, .vs_nproc = 3, .vs_proc = nfsd_acl_procedures3, .vs_count = nfsd_acl_count3, .vs_dispatch = nfsd_dispatch, .vs_xdrsize = NFS3_SVC_XDRSIZE, }; |